There are several different types of seizures, and they can happen for many different reasons. Seizures that are not due to epilepsy are sometimes called 'non-epileptic seizures'. They can have a physical cause such as low blood sugar (hypoglycaemia) or something related to the way the heart is working. Or non-epileptic seizures may have a psychological cause.
Cerakote in AR Barrel. Okay, so I built an AR using a BCM 18 stainless barrel. I thought I'd be smart and had the barrel professionally cerakoted by a local place that does work for Sig. Well, it looks like they may have used a pipe cleaner to block the gas port (total guess on my part), but it looks like there's some cured cerakote inside the barrel around the gas port. From what I can see, it looks like a small splotch. If I didn't know better, I'd think the gas port hole was over sized by the look of the cerakote. I can easily get a bore brush down the barrel so it doesn't seem to be obstructive.
As far as the mainsprings in the barrels go, they sometimes can be removed from the clock without taking the movement completely apart, but it still needs the power released first. After the barrel is in your hand, with the mainspring inside, it is time to take the cap off the barrel.